Nov.13 (GMM) Rubens Barrichello has vowed to retire from competitive motor racing if he fails to secure a race seat on the 2009 formula one grid.

The 36-year-old veteran's Honda ride is in serious doubt, as the Japanese team plans to evaluate alternatives Bruno Senna and Lucas di Grassi - both graduates of the GP2 series - at Barcelona next week.

"If they are good they will keep the position," Barrichello, whose more than 270 grands prix makes him the most experienced driver in F1 history, said.

Toro Rosso co-owner Gerhard Berger this week did not deny that the Faenza based team is in talks with the Brazilian about working together next year.

But if his F1 options do not materialise, Barrichello said he will not switch to American Indy racing, or another competitive series.

"Either I stay in F1 or I won't race," he said, speaking from his native Sao Paulo.